Invention Grant
- Patent Title: Electric insulating oil inspection method, electric insulating oil treatment method, and oil-filled electric device maintenance method
- Patent Title (中): 电绝缘油检查方法，电绝缘油处理方法和充油电器维修方法
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Application No.: US13816261Application Date: 2010-12-13
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Publication No.: US09228992B2Publication Date: 2016-01-05
- Inventor: Fukutaro Kato , Eiichi Nagao , Tsuyoshi Amimoto , Satoru Toyama , Kota Mizuno
- Applicant: Fukutaro Kato , Eiichi Nagao , Tsuyoshi Amimoto , Satoru Toyama , Kota Mizuno
- Applicant Address: JP Chiyoda-Ku, Tokyo
- Assignee: MITSUBISHI ELECTRIC CORPORATION
- Current Assignee: MITSUBISHI ELECTRIC CORPORATION
- Current Assignee Address: JP Chiyoda-Ku, Tokyo
- Agency: Buchanan Ingersoll & Rooney PC
- International Application: PCT/JP2010/072376 WO 20101213
- International Announcement: WO2012/081073 WO 20120621
- Main IPC: G01N33/28
- IPC: G01N33/28
Abstract:
The present invention relates to an electric insulating oil inspection method for determining whether or not an inhibitor-consuming substance is present in an electric insulating oil. The inhibitor-consuming substance is such a substance that causes to decrease over time a concentration of an inhibitor which is added to the electric insulating oil to inhibit copper sulfide from being generated on an insulating paper immersed in the electric insulating oil. The electric insulting oil inspection method includes steps of: preserving the electric insulating oil at a predetermined condition, measuring a concentration of the inhibitor, and determining that the inhibitor-consuming substance is present upon condition that a decrement of the concentration of the inhibitor relative to an initial concentration of the inhibitor becomes not less than a specified amount within a predetermined period.
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